Teoria, a Wulgaru princess, defects to humanity during the war against her species. She provides advanced Wulgaru technology to Earth's military, enabling the development of the AHSMB units used by Team Rabbit and their JURIA instinct-based control systems. Her technological contributions form the bedrock of humanity's defense against the Wulgaru invasion.

Initially enigmatic and cryptic, Teoria evolves into an active diplomatic and military participant. She personally intervenes by appearing before human leaders in her mecha to secure global cooperation for Operation Heaven's Gate, leveraging her royal status to unite Earth's fragmented governments against the Wulgaru threat. During the final battle at the Wulgaru warp gate, she fights directly alongside her aide Daneel, using her mecha to protect the Star Rose's trajectory and later assisting in retrieving Commander Simon's escape pod after its sacrificial impact destroys the gate.

Her character arc embodies the tension between Wulgaru individualism and humanity's communal instincts. While her species prioritizes unfettered personal desires and predatory behavior, Teoria embraces humanity's capacity for collective protection and familial bonds, positioning her as a narrative counterpoint to Wulgaru philosophy. Following the warp gate's destruction, she continues supporting Earth's forces in subsequent conflicts, including battles against remaining Wulgaru generals like Dioluna on Earth.

Her relationship with Team Rabbit shifts from distant benefactor to active ally, evident in her coordination with them during critical operations and her role in facilitating Izuru Hitachi's medical treatment after the discovery of his accelerated aging condition.